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An expanded genetic code with a functional quadruplet codon.

J Christopher Anderson1, Ning Wu, Stephen W Santoro

  • 1Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Proceedings of the National Academy of Sciences of the United States of America
|May 13, 2004
PubMed
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Researchers expanded the genetic code by creating a new system to incorporate unnatural amino acids using a quadruplet codon. This method allows for simultaneous incorporation of multiple novel amino acids, overcoming limitations of existing triplet codons.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Synthetic Biology

Background:

  • The genetic code universally encodes 20 amino acids, but expansion is possible with unique tRNA/aminoacyl-tRNA synthetase pairs and codons.
  • Existing methods using triplet codons like amber (TAG) are limited by codon availability.

Purpose of the Study:

  • To design and generate an orthogonal synthetase/tRNA pair for incorporating unnatural amino acids using a quadruplet codon.
  • To demonstrate the simultaneous incorporation of two distinct unnatural amino acids into proteins.

Main Methods:

  • Designed an orthogonal synthetase/tRNA pair from archaeal tRNA(Lys) sequences.
  • Utilized the quadruplet codon AGGA for unnatural amino acid incorporation.
  • Employed frameshift suppression with L-homoglutamine (hGln) and amber suppression for O-methyl-L-tyrosine.

Related Experiment Videos

Main Results:

  • Successfully generated an orthogonal pair that incorporates unnatural amino acids via the quadruplet codon AGGA.
  • Demonstrated frameshift suppression with L-homoglutamine (hGln) without impacting protein yields or cell growth.
  • Achieved simultaneous, site-specific incorporation of two unnatural amino acids (hGln and O-methyl-L-tyrosine) in myoglobin.

Conclusions:

  • The availability of quadruplet codons expands the capacity for genetic code expansion.
  • The translational machinery does not inherently limit the number of amino acids that can be encoded.
  • This work paves the way for significantly increasing the diversity of amino acids within proteins.